Per 1 October 2016, the immigration rules for interns who study at a Dutch university have changed. Before this date, an internship for foreign students at a Dutch university had to be mandatory to employ the intern without the requirement for a work permit. Now the internship should only be relevant for the study. All parties involved; student, employer and educational institution, should sign an internship agreement in which they agree about the relevancy and the appoitments made.
EP Nuffic provides a model internship agreement (https://www.epnuffic.nl/hoger-onderwijs/netwerken/cospa-netwerk/stageovereenkomst) that may be used for the administrative side of the internship.
This exemption on the immigration rules for interns only applies to foreign students who study in the Netherlands. For foreign students who study abroad and wish to do their internship in the Netherlands a work permit is still required and the internship must be mandatory for the completion of their studies.
Do you want to be sure which actions are needed? Just contact me and I will gladly provide you with my advice.